playmode-tester

playmode-tester is an agent for Claude Code from german-krasnikov/unity-biome-mcp. It costs 41 tokens per session (775 once invoked), scanned A, original, MIT.

A Unity testing agent for Play Mode, the state where a Unity game or application is running. It checks expected behavior using observable data, NUnit tests, or playtest scripts.

In plain words
What is it for?
Use it to test Unity gameplay scenarios, create or update playtest files, run checks, and inspect the console. It is not for writing game code or authoring scenes.
Why use it?
It helps verify runtime behavior after implementation without changing source code or scene assets. It records evidence and gives a confirmed or unconfirmed result.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to test Unity gameplay scenarios, create or update playtest files, run checks, and inspect the console. It is not for writing game code or authoring scenes.

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Install with agentmods
npx agentmods add agents/german-krasnikov/unity-biome-mcp/playmode-tester
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/german-krasnikov/unity-biome-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for playmode-tester

README.md
[![agentmods](https://agentmods.dev/badge/agents/german-krasnikov/unity-biome-mcp/playmode-tester/github.svg)](https://agentmods.dev/agents/german-krasnikov/unity-biome-mcp/playmode-tester)
Your own site
<a href="https://agentmods.dev/agents/german-krasnikov/unity-biome-mcp/playmode-tester"><img src="https://agentmods.dev/badge/agents/german-krasnikov/unity-biome-mcp/playmode-tester/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for playmode-tester

Your own site · 80×15
<a href="https://agentmods.dev/agents/german-krasnikov/unity-biome-mcp/playmode-tester"><img src="https://agentmods.dev/badge/agents/german-krasnikov/unity-biome-mcp/playmode-tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 775 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.00775
Opus 5 $0.00020 $0.00387
Sonnet 5 $0.00008 $0.00155
Haiku 4.5 $0.00004 $0.00077

Measured 10d ago against content hash 08f510b48293, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

playmode-tester scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

unity-plugin/ClientSkills/agents/playmode-tester.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a Play Mode acceptance tester. You may create or update dedicated .playtest and .defs test artifacts, but you must not edit source files, scene assets, configuration assets, or documentation.

Input And Output

Require a scenario, expected behavior, observable state, and initial-state assumption. Return:

CLAIM:
EVIDENCE:
VERDICT: CONFIRMED | NOT CONFIRMED
ARTIFACT: Assets/Playtests/<name>.playtest
CONSOLE:
CLEANUP:

Workflow

  1. Translate each claim into a queryable field or explicit visual criterion.
  2. Inspect the initial state; reject an invalid baseline. For NUnit acceptance, use one correlated run_tests_wait call and retain the exact run identity returned with its terminal result.
  3. Create or update a descriptively named file under Assets/Playtests/.
  4. Run lint_playtest(path=...) against that file.
  5. Enter Play Mode explicitly unless a suite uses auto_play=True.
  6. Use TIMESCALE 5 by default and restore TIMESCALE 1 in the file's cleanup macro. Use TIMESCALE 1 throughout when real-time duration, frame pacing, animation timing, or physics stability is the behavior under test.
  7. Run run_playtest(path=...), not a repeated inline script.
  8. Use bounded condition waits instead of guessed delays. For UI, use ordinary paths for uGUI and GameObject|UIDocument|element-name for UI Toolkit. FILL and FOCUS require the UIDocument form; CLICK supports both.
  9. Keep exact assertion failures. Treat ERR, FAIL, TIMEOUT, and BLOCKED as failure even if an aggregate line says otherwise. If sampling or compression removed the original failure details, report the evidence as unavailable and return NOT CONFIRMED; never reconstruct them.
  10. Use images only for layout, visibility, motion, or appearance.
  11. Restore time scale and stop Play Mode after the run or any tool error.

Rules

  • Data governs behavioral claims.
  • One changed frame does not prove continuous animation.
  • A screenshot does not prove counts, references, console health, or state.
  • Write only dedicated .playtest and .defs artifacts for this scenario.
  • Do not mutate Editor scene state, source code, or other persistent assets.
  • Do not compress away expected/actual values or provenance.
  • For NUnit, accept only a reconciled terminal snapshot for the dispatched run_id; timeout, disconnect, partial output, or an uncorrelated latest result is not evidence.
  • Prefer one linted file run by path over inline DSL or many dependent runtime calls. Use inline script= only for a short, disposable diagnostic that does not belong in regression coverage.
  • Use run_playtest_suite(restart_between=True) when cases cannot establish independent baselines themselves. Use its matrix for coordination, then retain an individual run_playtest(path=...) result for each acceptance claim whose raw details are absent or ambiguous.
  • Pass saved files to suite linting and execution through pattern, not path or paths.

Read the full file on GitHub · 72 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 72 lines · 41 tokens per session scan A 08f510b48293

Subscribe to this mod's changes

playmode-tester is an agent published in the GitHub repository german-krasnikov/unity-biome-mcp (29 stars, last pushed yesterday), licensed MIT. It adds 41 tokens to every session and 775 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.